Conveners
Parallel 8: Solar
- Nicola Omodei (Stanford University)
We have reconstructed the gamma-ray flux from the Moon in the energy range from 30 MeV up to a few GeV using a 14-years dataset collected by the Fermi Large Area Telescope since its launch in 2008. Gamma rays from the Moon are originated in the interactions of cosmic-ray nuclei with the regolith of the lunar surface and their flux is sensitive to solar activity, which modulates the charged...
All known small Solar System bodies have a diameter between 1 m and a few thousands of km. Based on the collisional evolution of Solar System bodies, a model predicting the existence of a larger number of asteroids with diameters down to 10 m has been suggested. In this work, we propose an extension of this model to diameters of a few cm. Like all Solar System bodies, asteroids can be passive...
The increasing number of long-duration gamma-ray solar flares >100 MeV observed by Fermi/LAT poses a puzzle on the particle acceleration and transport mechanisms. Since most of the long-duration events are associated with fast coronal mass ejections (CMEs), it is therefore intriguing to understand the role of CMEs and CME-driven shocks in these events. In this study, we perform data-driven,...
Fermi routinely observes gamma-rays from the quiet Sun (QS), i.e. when there is no flaring activity, and there are upper limits in X-ray regime from RHESSI. The gamma-rays are produced by Cosmic Ray (CR) protons (via pion production) and electrons via inverse Compton (IC) scattering of solar optical photons. This problem has received considerable attention. A possible source of the X-rays...
